Pneumatic rapper.



Nm` 806.740. PATENTED DBG. 5, 1905. H. B. GRINER.

:PNEUMATIC RAPPER.

APPLICATION FILED 1330.14. 1904;

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UNITED sTATEs PATENT OEEICE.

HARRY B. GRINER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF CHICAGO, ILLINOIS, A

CORPORATION OF NEW JERSEY.

PNEUNIATIC RAPPER.

Specification of Letters Patent.

Patented Dec. 5, 1905.

Application filed December 14, 1904. Serial No. 236,811.

To LZZ whom, t may concern:

Be it known that I, HARRY B. GRINER, a citizen of the United States,`,residing in the city and county of Philadelphia,'State of Pennsylvania, have invented anew and useful Pneumatic Rapper, of which the following isla specification.

Heretofore in bench-molding it has been the custom for a molder to have a helper or assistant who strikes the bench with a mallet or hammer in order to separate the cope from the drag or pattern, as will be understood by those skilled in the art, this method of procedure requiring two operations.

By my present invention one personV is enabled to perform all the steps heretofore requiring two operations, since I provide mechanical means operated by the knee or other part of the body of the single operator whereby the desired results are attained and the single operator is enabled to have his hands at all times free, whereby agreat saving of time and labor is edected.

To the above ends my lnvention consists,

broadly, of a novel construction of a pneumatic rapper for use in bench-molding and other operations in which it is desired to .give a jar or vibration to the working bench.

It also consists in a novel construction of controlling-valve and its adjuncts, which may be located at any desired distance from apneumatic device to which it is connected, and in novel means for attaching the device to the working bench.

It further consists of other novel features of construction, all as will be hereinafter fully set forth, wherebyT the cost of bench-molding or other bench operations is greatly lessened and a large amount of time and labor saved.

Figure 1 represents a vertical sectional view of a pneumatic rapper embodying my invention, certain of the parts being shown in elevation. Fig. 2 represents a transverse section on line a; w, Eig. 1, of the clamping-jaw with the pneumatic rapper' removed.' Fig. 3 represents a perspective view showing the rapper and its adjuncts in assembled position.

Similar numerals of reference indicate corresponding parts in the iigures.

Referring to the drawings, 1 designates a bench to which is secured vat any desired point, by means of screws 3 or other equivalent means, the casing 2 of the controlling mechanism, having a motive-fluid passage or duct 4 therethrough, both the inlet end 5 and outlet end 6 of which are threaded, so as to receive theend of the hose or other connections through which the motive fluid passes.

7 designates a valve consisting of two heads 8 and 9-in the present instance of equal areasaid heads being joined by the neck or annular groove 10, the head 8 having astem 11 extending through the cap 12 of the casing 2. Between the end of the head 9 and the bottom of the chamber 13 a spring 14 is inserted, which tends to keep the valve normally closed, the head 9 tending to close the passage 4, and improper movement of the valve being prevented by its contact with the cap or nut 12. At the end of the stem 11 is secured an arm or pressure-piece 15, which is adapted to be actuatedby the knee or other part of the body of the operator.

16 designates the inlet-pipe for the motive fluid, which after passing through the casing 2 iiows through the connection 17, leading from the outlet 6 to the inlet 18 of a pneumatic hammer or similar device 19, which may be of any approved type, such as the Keller patent, No. 549,514, dated November 12, 1895, having a reciprocating pistonl 2O therein adapted to strike the end of the shank 21, which extends through the bushing 22, se-

cured in the end of the tool.

The shank 21 has at its outer end a head 23, in which is a slot 24, adapted to retain a block of wood or suitable material 25. whereby the blow of the hammer will beimparted to the bench 1 through said block. The pneumatic tool or cylinder 19 is adjustably secured in a clamp 26 of novel construction, slotted at one end at 27, through which extends transversely a bolt 28, having a nut 29 thereon by means of which the slotted members are drawn together, thus securely clamping the tool 19 when the parts are assembled, as seen in Fig. 1.

30 designates a lug on the clamp 26, having l an opening adapted to receive the depending similar material 25, held in the head 23, contacts with the under side of the bench the device will be securely held in place.

The operation is as follows: The parts normally appear as seen in Fig. 1, the head 9 of the valve closing the duct 4 and the piston 2O of the hammer or rapping device being stationary. When it is desired to cause the, reciprocations of the piston, the operator with his knee or other portion of his body presses against the pressure-piece 15, so that the same, together with the head 9, is raised so that the neck 10 is in alinement with the duct 4,where upon air can flow directly to the cylinder 19, whereupon the reciprocations of the piston 20 will commence and will continue until pressure is removed from the part 15, whereupon the spring 14 will close the valve 7 the parts vthen appearing as seen in Fig. 1. As the clamping-jaw is adjustable on the rod, the range of adjustability is very great, permitting the use of blocks of different sizes. The controllingvalve 7 may be placed at any convenient point or at any desired distance from the tool, and it is evident that the valve will open when any part of the operator presses against the leverarm of the valve and will automatically closewhen such pressure is removed. The tool is clamped to the bench at a suitable point, andl when the operator wishes the bench to be jarred or struck he presses against the leverarm of the throttle-valve. The valve will then open and permit the motive fluid to pass through the inlet 5, passage 4, around the reduced neck S, through the outlet 6, connection 17, and inlet 18 into the tool 19, whereby the motive fluid will actuate thesame and cause the piston 20 therein to strike blows, as desired, against the shank 21, the force of said blow being communicated to the bench 1 through the block 25, which is clamped against the bench.

As above explained, it has heretofore been the custom for a molder in bench-molding to have a helper who strikes the bench with a mallet or hammer in order to separate the cope from the drag or pattern; but by the use of my present invention one attendant is dispensed with, and as the molder may have his hands at all times free to do their work a great saving of time and labor is accomplished.

I have deemed it unnecessary to describe in detail the construction of the pneumatic tool,

since any type of the same may be employed according to requirements, the tool in the present instance being of the valveless type, although a valved tool may be employed, if desired. It will be further apparent that the Aknee or body operated device 15 and its adjuncts may be secured to any desired fixed point and at any angle so long las it is conveniently accessible to the operator.

It will be apparent that the parts 33 31 26 and their adjuncts form, broadly, aclamping device whereby the block 25 may normally always be in contact with the under side of the bench 1, substantially as shown in Fig. 1. So far as I am aware, I am the first to produce a concrete unitary device of this character, and my claims for the same are therefore to be interpreted with corresponding scope.

It will be evident that various changes may be made by those skilled in the art which may come within the scope of my invention, and I do not, therefore, desire to be limited in every instance to the exactconstruction herein shown and described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a pneumatic bench-rapper, the combination of a pneumatic tool, a rapping device actuated thereby and constructed to be reciprocated to vibrate the mold-support by impact, means for leading motive fluid to said tool, adjustable holding means for said ,tool and rapping device and embodying a lower clamping-jaw in which said tool is held, and a controlling device wholly independent of said tool and adapted to be actuated by the knee or 'body of the operator.

2. In a device of the character described, a tool-supporting clamp for securing a pneumatic toolto a bench and in the lower clamping-jaw of which said tool is held, a controlling-valve connected with said tool and independently supported by said bench, positive means for closing said valve automatically when the pressure is removed therefrom, a rapping device disposed to be actuated by said tool to vibrate said bench by reciprocatory impact, and means for adjustably mounting said clamp.

3. In a device of the character named, a clamping device comprising an upper and a lower jaw, a rody rigidly fastened to said upper jaw, the lower jaw being adjustably mounted on said rod and adapted to receive and support a pneumatic hammer, a screw mounted on the upper jaw adapted to contact with a bench and thus clamp said hammer in position a pneumatic hammer supported in said lower jaw to act by impact and a controllingvalve independently supported and automatically closing when the pressure is removed.

4. In a device of lche character described, a jaw, a rod or bar extending therefrom, clamping means on said jaw, a bolt whereby a pneumatic tool may be securely retained in position, a pneumatic hammer held by said clamping means to act by impact against the moldsupporta valve-casing independently supported, a motive-Huid passage leading therefrom, one end of said passage being adapted to be connected with a motive-fluid supply and the other end with a connection leading to said tool, a valve normally throttling said passage, a device on said valve against which the operator presses to actuate said valve, the latter IOO IIO

sure-piece adapted to be actuated by the knee' of the operator, a spring for returning said piece to its normal position, and a connection 10 between the same and the caslng of said rapper.

HARRY B. GRINER. Witnesses:

JOHN A. WIEDERSHEIM, E. HAYWARD FAIRBANKS. 

